1 In Windows 10, the key combination WindowsKey+PrntScrn sends a png picture of your screen to your Screenshots folder. When this happens, the screen momentarily dims slightly to tell you that you are doing it. If your PrntScrn key has two jobs then you may need to press the Fn key as well -> Fn-WinKey-PrntScrn.
Wiktionary (5.00 / 10 votes) Rate this definition: petroleum (Noun). A flammable liquid ranging in color from clear to very dark brown and black, consisting mainly of hydrocarbons, occurring naturally in deposits under earth surface. Origin: From petroleum, from petra + oleum.
Petroleum, or crude oil, is a fossil fuel that is frequently associated with the production of gasoline, kerosene, and diesel oil, but it has many uses. Some household products, such as detergent and candles, are made from petroleum. Synthetic fibers, CDs and DVDs are other products made from petroleum.